right triangle
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Sorry, there is no such thing as a rectangular triangle.
It's very difficult to determine an answer, sincethere is no such thing as a rectangular triangle.
A triangle with a rectangular base is typically referred to as a triangular prism when considering the three-dimensional shape. However, if you're referring specifically to a two-dimensional triangle that has one of its sides as the base of a rectangle, it doesn't have a unique name and is generally just called a triangle. In the context of geometry, the key characteristics would be the right angle formed at the base if the triangle is right-angled.
This depends on whether or not the prism is a rectangular prism or not. Simple shape prisms (rectangular, triangle, octagonal, hexagonal) all have rectangular faces.
No matter how a triangle is described it will always have just three sides.